kunsx Posted October 21, 2014 Report Share Posted October 21, 2014 Just got my "new" engine started in my 521 pick up and was a bit dissapointed since the power only was around 100hk in the dyno bench. The engine is from a truck but I have replaced the inlet manifold with one from a Nissan Prairie. There is KMS engine management system and is tuned in a dyno bench. There is a few things I think of myself, 1: To small exhaust- only 2" so get that rebuild to 2,5" 2: Myabe my O2 sensor is not working right or temp sensor- to be checked out. 3: I have the complete cylinder head of the Prairie engine- get that one ported and planed 1-2mm and replace. Any ideas is much apreciated. Quote Link to comment
datzenmike Posted October 21, 2014 Report Share Posted October 21, 2014 1/ Two inch is plenty for an unmodified engine. 2/ O2 sensor is only used by the ECU during part throttle and when engine is warmed up. Full throttle I believe forces the ECU to revert back to a stored air/fuel map that is much richer for better performance and not for economy. I may not be explaining this properly but this is close. Could the TPS (throttle position sensor) not be signaling that you are at full throttle? 3/ If this is something else out of adjustment, a ported head will be an expensive disappointment. Quote Link to comment
datson4life Posted October 21, 2014 Report Share Posted October 21, 2014 My ka lacked power, but after timing it (about right) new o2, and new spark plugs, it was night and day Quote Link to comment
flatcat19 Posted October 21, 2014 Report Share Posted October 21, 2014 TPS or MAF. Quote Link to comment
kunsx Posted October 21, 2014 Author Report Share Posted October 21, 2014 Thanks for the answers, I am away from home at work but I will certanly check out the O2 sensor and change to new spark plugs when I get back. Quote Link to comment
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